I suggst finding a different spot for the speakers. Anything large placed between them will be greatly detrimental to the sound. If its a real fire place with a flu...all your lows will go up that flu. Bad placement.
Cable length dilemma!
Ok, so here's the dilemma: speakers placed on either side of a fireplace, impossible to place the amp between them. Only place to put the amp is just to the left of the left speaker, leaving a 1-foot run to the left speaker, and a 9-foot rum to the right speaker. I have always read that your L/R cables should be the same length, but in my case that would necessitate coiling 8ft of the L cable underneath the rack, which is the lesser of two evils here - mismatched length, or a big coil of cable under the rack?